Stadium: Court 10 Round: 26 Ground: Clay
| ITF Argentina F1 | 2018/05/14 12:00 | Gaston E Cantero v Guido Ivan Justo | 6-3,6-3 |
| ITF Argentina F1 | 2018/05/12 17:30 | Lautaro Agustin Falabella v Guido Ivan Justo | 3-6,4-6 |
| ITF Argentina F12 | 2017/12/05 17:00 | Alejo Vilaro v Guido Ivan Justo | 6-2,6-1 |
| ITF Argentina F12 | 2017/12/04 12:00 | Leonardo Aboian v Guido Ivan Justo | 2-6,4-6 |
| ITF Argentina F12 | 2017/12/03 12:00 | Guido Ivan Justo v Jeff Guerrero | 6-1,6-0 |
| ITF Argentina F12 | 2017/12/02 12:00 | Guido Ivan Justo v Tiago Seweryniak | 4-6,7-5,6-2 |
| ITF Argentina F11 | 2017/11/28 19:55 | Juan Ignacio Galarza v Guido Ivan Justo | 6-4,6-4 |
| ITF Argentina F9 | 2017/11/12 13:00 | Guido Ivan Justo v Valentin Florez | 6-4,1-6,2-6 |
| ITF Brazil F4 | 2018/05/16 22:10 | Gonzalo Villanueva v Thiago Seyboth Wild | 3-6,5-7 |
| ITF Brazil F4 | 2018/05/14 17:15 | Gonzalo Villanueva v Alejandro Tabilo | 7-6,6-3 |
| ITF Brazil F3 | 2018/05/08 13:00 | Gonzalo Villanueva v Rafael Matos | 2-6,6-3,3-6 |
| ITF Brazil F2 | 2018/05/06 15:00 | Gonzalo Villanueva v Rafael Matos | 1-6,3-6 |
| ITF Brazil F2 | 2018/05/05 18:05 | Gonzalo Villanueva v Oscar Jose Gutierrez | 6-7,6-3,6-3 |
| ITF Brazil F2 | 2018/05/04 17:30 | Marcelo Zormann v Gonzalo Villanueva | 6-4,6-7,5-7 |
| ITF Brazil F2 | 2018/05/01 18:40 | Gonzalo Villanueva v Tomas Martin Etcheverry | 5-7,6-3,7-6 |
| ITF Brazil F1 | 2018/04/25 15:30 | Daniel Dutra Da Silva v Gonzalo Villanueva | 7-5,7-6 |